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Merge remote-tracking branch 'asoc/topic/tegra' into asoc-next
[deliverable/linux.git] / drivers / usb / core / devio.c
1 /*****************************************************************************/
2
3 /*
4 * devio.c -- User space communication with USB devices.
5 *
6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * This file implements the usbfs/x/y files, where
23 * x is the bus number and y the device number.
24 *
25 * It allows user space programs/"drivers" to communicate directly
26 * with USB devices without intervening kernel driver.
27 *
28 * Revision history
29 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
30 * 04.01.2000 0.2 Turned into its own filesystem
31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
32 * (CAN-2005-3055)
33 */
34
35 /*****************************************************************************/
36
37 #include <linux/fs.h>
38 #include <linux/mm.h>
39 #include <linux/slab.h>
40 #include <linux/signal.h>
41 #include <linux/poll.h>
42 #include <linux/module.h>
43 #include <linux/string.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/usb/hcd.h> /* for usbcore internals */
47 #include <linux/cdev.h>
48 #include <linux/notifier.h>
49 #include <linux/security.h>
50 #include <linux/user_namespace.h>
51 #include <linux/scatterlist.h>
52 #include <linux/uaccess.h>
53 #include <asm/byteorder.h>
54 #include <linux/moduleparam.h>
55
56 #include "usb.h"
57
58 #define USB_MAXBUS 64
59 #define USB_DEVICE_MAX (USB_MAXBUS * 128)
60 #define USB_SG_SIZE 16384 /* split-size for large txs */
61
62 /* Mutual exclusion for removal, open, and release */
63 DEFINE_MUTEX(usbfs_mutex);
64
65 struct dev_state {
66 struct list_head list; /* state list */
67 struct usb_device *dev;
68 struct file *file;
69 spinlock_t lock; /* protects the async urb lists */
70 struct list_head async_pending;
71 struct list_head async_completed;
72 wait_queue_head_t wait; /* wake up if a request completed */
73 unsigned int discsignr;
74 struct pid *disc_pid;
75 const struct cred *cred;
76 void __user *disccontext;
77 unsigned long ifclaimed;
78 u32 secid;
79 u32 disabled_bulk_eps;
80 };
81
82 struct async {
83 struct list_head asynclist;
84 struct dev_state *ps;
85 struct pid *pid;
86 const struct cred *cred;
87 unsigned int signr;
88 unsigned int ifnum;
89 void __user *userbuffer;
90 void __user *userurb;
91 struct urb *urb;
92 unsigned int mem_usage;
93 int status;
94 u32 secid;
95 u8 bulk_addr;
96 u8 bulk_status;
97 };
98
99 static bool usbfs_snoop;
100 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
101 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
102
103 #define snoop(dev, format, arg...) \
104 do { \
105 if (usbfs_snoop) \
106 dev_info(dev , format , ## arg); \
107 } while (0)
108
109 enum snoop_when {
110 SUBMIT, COMPLETE
111 };
112
113 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
114
115 /* Limit on the total amount of memory we can allocate for transfers */
116 static unsigned usbfs_memory_mb = 16;
117 module_param(usbfs_memory_mb, uint, 0644);
118 MODULE_PARM_DESC(usbfs_memory_mb,
119 "maximum MB allowed for usbfs buffers (0 = no limit)");
120
121 /* Hard limit, necessary to avoid aithmetic overflow */
122 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
123
124 static atomic_t usbfs_memory_usage; /* Total memory currently allocated */
125
126 /* Check whether it's okay to allocate more memory for a transfer */
127 static int usbfs_increase_memory_usage(unsigned amount)
128 {
129 unsigned lim;
130
131 /*
132 * Convert usbfs_memory_mb to bytes, avoiding overflows.
133 * 0 means use the hard limit (effectively unlimited).
134 */
135 lim = ACCESS_ONCE(usbfs_memory_mb);
136 if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
137 lim = USBFS_XFER_MAX;
138 else
139 lim <<= 20;
140
141 atomic_add(amount, &usbfs_memory_usage);
142 if (atomic_read(&usbfs_memory_usage) <= lim)
143 return 0;
144 atomic_sub(amount, &usbfs_memory_usage);
145 return -ENOMEM;
146 }
147
148 /* Memory for a transfer is being deallocated */
149 static void usbfs_decrease_memory_usage(unsigned amount)
150 {
151 atomic_sub(amount, &usbfs_memory_usage);
152 }
153
154 static int connected(struct dev_state *ps)
155 {
156 return (!list_empty(&ps->list) &&
157 ps->dev->state != USB_STATE_NOTATTACHED);
158 }
159
160 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
161 {
162 loff_t ret;
163
164 mutex_lock(&file_inode(file)->i_mutex);
165
166 switch (orig) {
167 case 0:
168 file->f_pos = offset;
169 ret = file->f_pos;
170 break;
171 case 1:
172 file->f_pos += offset;
173 ret = file->f_pos;
174 break;
175 case 2:
176 default:
177 ret = -EINVAL;
178 }
179
180 mutex_unlock(&file_inode(file)->i_mutex);
181 return ret;
182 }
183
184 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
185 loff_t *ppos)
186 {
187 struct dev_state *ps = file->private_data;
188 struct usb_device *dev = ps->dev;
189 ssize_t ret = 0;
190 unsigned len;
191 loff_t pos;
192 int i;
193
194 pos = *ppos;
195 usb_lock_device(dev);
196 if (!connected(ps)) {
197 ret = -ENODEV;
198 goto err;
199 } else if (pos < 0) {
200 ret = -EINVAL;
201 goto err;
202 }
203
204 if (pos < sizeof(struct usb_device_descriptor)) {
205 /* 18 bytes - fits on the stack */
206 struct usb_device_descriptor temp_desc;
207
208 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
209 le16_to_cpus(&temp_desc.bcdUSB);
210 le16_to_cpus(&temp_desc.idVendor);
211 le16_to_cpus(&temp_desc.idProduct);
212 le16_to_cpus(&temp_desc.bcdDevice);
213
214 len = sizeof(struct usb_device_descriptor) - pos;
215 if (len > nbytes)
216 len = nbytes;
217 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
218 ret = -EFAULT;
219 goto err;
220 }
221
222 *ppos += len;
223 buf += len;
224 nbytes -= len;
225 ret += len;
226 }
227
228 pos = sizeof(struct usb_device_descriptor);
229 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
230 struct usb_config_descriptor *config =
231 (struct usb_config_descriptor *)dev->rawdescriptors[i];
232 unsigned int length = le16_to_cpu(config->wTotalLength);
233
234 if (*ppos < pos + length) {
235
236 /* The descriptor may claim to be longer than it
237 * really is. Here is the actual allocated length. */
238 unsigned alloclen =
239 le16_to_cpu(dev->config[i].desc.wTotalLength);
240
241 len = length - (*ppos - pos);
242 if (len > nbytes)
243 len = nbytes;
244
245 /* Simply don't write (skip over) unallocated parts */
246 if (alloclen > (*ppos - pos)) {
247 alloclen -= (*ppos - pos);
248 if (copy_to_user(buf,
249 dev->rawdescriptors[i] + (*ppos - pos),
250 min(len, alloclen))) {
251 ret = -EFAULT;
252 goto err;
253 }
254 }
255
256 *ppos += len;
257 buf += len;
258 nbytes -= len;
259 ret += len;
260 }
261
262 pos += length;
263 }
264
265 err:
266 usb_unlock_device(dev);
267 return ret;
268 }
269
270 /*
271 * async list handling
272 */
273
274 static struct async *alloc_async(unsigned int numisoframes)
275 {
276 struct async *as;
277
278 as = kzalloc(sizeof(struct async), GFP_KERNEL);
279 if (!as)
280 return NULL;
281 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
282 if (!as->urb) {
283 kfree(as);
284 return NULL;
285 }
286 return as;
287 }
288
289 static void free_async(struct async *as)
290 {
291 int i;
292
293 put_pid(as->pid);
294 if (as->cred)
295 put_cred(as->cred);
296 for (i = 0; i < as->urb->num_sgs; i++) {
297 if (sg_page(&as->urb->sg[i]))
298 kfree(sg_virt(&as->urb->sg[i]));
299 }
300 kfree(as->urb->sg);
301 kfree(as->urb->transfer_buffer);
302 kfree(as->urb->setup_packet);
303 usb_free_urb(as->urb);
304 usbfs_decrease_memory_usage(as->mem_usage);
305 kfree(as);
306 }
307
308 static void async_newpending(struct async *as)
309 {
310 struct dev_state *ps = as->ps;
311 unsigned long flags;
312
313 spin_lock_irqsave(&ps->lock, flags);
314 list_add_tail(&as->asynclist, &ps->async_pending);
315 spin_unlock_irqrestore(&ps->lock, flags);
316 }
317
318 static void async_removepending(struct async *as)
319 {
320 struct dev_state *ps = as->ps;
321 unsigned long flags;
322
323 spin_lock_irqsave(&ps->lock, flags);
324 list_del_init(&as->asynclist);
325 spin_unlock_irqrestore(&ps->lock, flags);
326 }
327
328 static struct async *async_getcompleted(struct dev_state *ps)
329 {
330 unsigned long flags;
331 struct async *as = NULL;
332
333 spin_lock_irqsave(&ps->lock, flags);
334 if (!list_empty(&ps->async_completed)) {
335 as = list_entry(ps->async_completed.next, struct async,
336 asynclist);
337 list_del_init(&as->asynclist);
338 }
339 spin_unlock_irqrestore(&ps->lock, flags);
340 return as;
341 }
342
343 static struct async *async_getpending(struct dev_state *ps,
344 void __user *userurb)
345 {
346 struct async *as;
347
348 list_for_each_entry(as, &ps->async_pending, asynclist)
349 if (as->userurb == userurb) {
350 list_del_init(&as->asynclist);
351 return as;
352 }
353
354 return NULL;
355 }
356
357 static void snoop_urb(struct usb_device *udev,
358 void __user *userurb, int pipe, unsigned length,
359 int timeout_or_status, enum snoop_when when,
360 unsigned char *data, unsigned data_len)
361 {
362 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
363 static const char *dirs[] = {"out", "in"};
364 int ep;
365 const char *t, *d;
366
367 if (!usbfs_snoop)
368 return;
369
370 ep = usb_pipeendpoint(pipe);
371 t = types[usb_pipetype(pipe)];
372 d = dirs[!!usb_pipein(pipe)];
373
374 if (userurb) { /* Async */
375 if (when == SUBMIT)
376 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
377 "length %u\n",
378 userurb, ep, t, d, length);
379 else
380 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
381 "actual_length %u status %d\n",
382 userurb, ep, t, d, length,
383 timeout_or_status);
384 } else {
385 if (when == SUBMIT)
386 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
387 "timeout %d\n",
388 ep, t, d, length, timeout_or_status);
389 else
390 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
391 "status %d\n",
392 ep, t, d, length, timeout_or_status);
393 }
394
395 if (data && data_len > 0) {
396 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
397 data, data_len, 1);
398 }
399 }
400
401 static void snoop_urb_data(struct urb *urb, unsigned len)
402 {
403 int i, size;
404
405 if (!usbfs_snoop)
406 return;
407
408 if (urb->num_sgs == 0) {
409 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
410 urb->transfer_buffer, len, 1);
411 return;
412 }
413
414 for (i = 0; i < urb->num_sgs && len; i++) {
415 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
416 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
417 sg_virt(&urb->sg[i]), size, 1);
418 len -= size;
419 }
420 }
421
422 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
423 {
424 unsigned i, len, size;
425
426 if (urb->number_of_packets > 0) /* Isochronous */
427 len = urb->transfer_buffer_length;
428 else /* Non-Isoc */
429 len = urb->actual_length;
430
431 if (urb->num_sgs == 0) {
432 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
433 return -EFAULT;
434 return 0;
435 }
436
437 for (i = 0; i < urb->num_sgs && len; i++) {
438 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
439 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
440 return -EFAULT;
441 userbuffer += size;
442 len -= size;
443 }
444
445 return 0;
446 }
447
448 #define AS_CONTINUATION 1
449 #define AS_UNLINK 2
450
451 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
452 __releases(ps->lock)
453 __acquires(ps->lock)
454 {
455 struct urb *urb;
456 struct async *as;
457
458 /* Mark all the pending URBs that match bulk_addr, up to but not
459 * including the first one without AS_CONTINUATION. If such an
460 * URB is encountered then a new transfer has already started so
461 * the endpoint doesn't need to be disabled; otherwise it does.
462 */
463 list_for_each_entry(as, &ps->async_pending, asynclist) {
464 if (as->bulk_addr == bulk_addr) {
465 if (as->bulk_status != AS_CONTINUATION)
466 goto rescan;
467 as->bulk_status = AS_UNLINK;
468 as->bulk_addr = 0;
469 }
470 }
471 ps->disabled_bulk_eps |= (1 << bulk_addr);
472
473 /* Now carefully unlink all the marked pending URBs */
474 rescan:
475 list_for_each_entry(as, &ps->async_pending, asynclist) {
476 if (as->bulk_status == AS_UNLINK) {
477 as->bulk_status = 0; /* Only once */
478 urb = as->urb;
479 usb_get_urb(urb);
480 spin_unlock(&ps->lock); /* Allow completions */
481 usb_unlink_urb(urb);
482 usb_put_urb(urb);
483 spin_lock(&ps->lock);
484 goto rescan;
485 }
486 }
487 }
488
489 static void async_completed(struct urb *urb)
490 {
491 struct async *as = urb->context;
492 struct dev_state *ps = as->ps;
493 struct siginfo sinfo;
494 struct pid *pid = NULL;
495 u32 secid = 0;
496 const struct cred *cred = NULL;
497 int signr;
498
499 spin_lock(&ps->lock);
500 list_move_tail(&as->asynclist, &ps->async_completed);
501 as->status = urb->status;
502 signr = as->signr;
503 if (signr) {
504 sinfo.si_signo = as->signr;
505 sinfo.si_errno = as->status;
506 sinfo.si_code = SI_ASYNCIO;
507 sinfo.si_addr = as->userurb;
508 pid = get_pid(as->pid);
509 cred = get_cred(as->cred);
510 secid = as->secid;
511 }
512 snoop(&urb->dev->dev, "urb complete\n");
513 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
514 as->status, COMPLETE, NULL, 0);
515 if ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_IN)
516 snoop_urb_data(urb, urb->actual_length);
517
518 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
519 as->status != -ENOENT)
520 cancel_bulk_urbs(ps, as->bulk_addr);
521 spin_unlock(&ps->lock);
522
523 if (signr) {
524 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
525 put_pid(pid);
526 put_cred(cred);
527 }
528
529 wake_up(&ps->wait);
530 }
531
532 static void destroy_async(struct dev_state *ps, struct list_head *list)
533 {
534 struct urb *urb;
535 struct async *as;
536 unsigned long flags;
537
538 spin_lock_irqsave(&ps->lock, flags);
539 while (!list_empty(list)) {
540 as = list_entry(list->next, struct async, asynclist);
541 list_del_init(&as->asynclist);
542 urb = as->urb;
543 usb_get_urb(urb);
544
545 /* drop the spinlock so the completion handler can run */
546 spin_unlock_irqrestore(&ps->lock, flags);
547 usb_kill_urb(urb);
548 usb_put_urb(urb);
549 spin_lock_irqsave(&ps->lock, flags);
550 }
551 spin_unlock_irqrestore(&ps->lock, flags);
552 }
553
554 static void destroy_async_on_interface(struct dev_state *ps,
555 unsigned int ifnum)
556 {
557 struct list_head *p, *q, hitlist;
558 unsigned long flags;
559
560 INIT_LIST_HEAD(&hitlist);
561 spin_lock_irqsave(&ps->lock, flags);
562 list_for_each_safe(p, q, &ps->async_pending)
563 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
564 list_move_tail(p, &hitlist);
565 spin_unlock_irqrestore(&ps->lock, flags);
566 destroy_async(ps, &hitlist);
567 }
568
569 static void destroy_all_async(struct dev_state *ps)
570 {
571 destroy_async(ps, &ps->async_pending);
572 }
573
574 /*
575 * interface claims are made only at the request of user level code,
576 * which can also release them (explicitly or by closing files).
577 * they're also undone when devices disconnect.
578 */
579
580 static int driver_probe(struct usb_interface *intf,
581 const struct usb_device_id *id)
582 {
583 return -ENODEV;
584 }
585
586 static void driver_disconnect(struct usb_interface *intf)
587 {
588 struct dev_state *ps = usb_get_intfdata(intf);
589 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
590
591 if (!ps)
592 return;
593
594 /* NOTE: this relies on usbcore having canceled and completed
595 * all pending I/O requests; 2.6 does that.
596 */
597
598 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
599 clear_bit(ifnum, &ps->ifclaimed);
600 else
601 dev_warn(&intf->dev, "interface number %u out of range\n",
602 ifnum);
603
604 usb_set_intfdata(intf, NULL);
605
606 /* force async requests to complete */
607 destroy_async_on_interface(ps, ifnum);
608 }
609
610 /* The following routines are merely placeholders. There is no way
611 * to inform a user task about suspend or resumes.
612 */
613 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
614 {
615 return 0;
616 }
617
618 static int driver_resume(struct usb_interface *intf)
619 {
620 return 0;
621 }
622
623 struct usb_driver usbfs_driver = {
624 .name = "usbfs",
625 .probe = driver_probe,
626 .disconnect = driver_disconnect,
627 .suspend = driver_suspend,
628 .resume = driver_resume,
629 };
630
631 static int claimintf(struct dev_state *ps, unsigned int ifnum)
632 {
633 struct usb_device *dev = ps->dev;
634 struct usb_interface *intf;
635 int err;
636
637 if (ifnum >= 8*sizeof(ps->ifclaimed))
638 return -EINVAL;
639 /* already claimed */
640 if (test_bit(ifnum, &ps->ifclaimed))
641 return 0;
642
643 intf = usb_ifnum_to_if(dev, ifnum);
644 if (!intf)
645 err = -ENOENT;
646 else
647 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
648 if (err == 0)
649 set_bit(ifnum, &ps->ifclaimed);
650 return err;
651 }
652
653 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
654 {
655 struct usb_device *dev;
656 struct usb_interface *intf;
657 int err;
658
659 err = -EINVAL;
660 if (ifnum >= 8*sizeof(ps->ifclaimed))
661 return err;
662 dev = ps->dev;
663 intf = usb_ifnum_to_if(dev, ifnum);
664 if (!intf)
665 err = -ENOENT;
666 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
667 usb_driver_release_interface(&usbfs_driver, intf);
668 err = 0;
669 }
670 return err;
671 }
672
673 static int checkintf(struct dev_state *ps, unsigned int ifnum)
674 {
675 if (ps->dev->state != USB_STATE_CONFIGURED)
676 return -EHOSTUNREACH;
677 if (ifnum >= 8*sizeof(ps->ifclaimed))
678 return -EINVAL;
679 if (test_bit(ifnum, &ps->ifclaimed))
680 return 0;
681 /* if not yet claimed, claim it for the driver */
682 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
683 "interface %u before use\n", task_pid_nr(current),
684 current->comm, ifnum);
685 return claimintf(ps, ifnum);
686 }
687
688 static int findintfep(struct usb_device *dev, unsigned int ep)
689 {
690 unsigned int i, j, e;
691 struct usb_interface *intf;
692 struct usb_host_interface *alts;
693 struct usb_endpoint_descriptor *endpt;
694
695 if (ep & ~(USB_DIR_IN|0xf))
696 return -EINVAL;
697 if (!dev->actconfig)
698 return -ESRCH;
699 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
700 intf = dev->actconfig->interface[i];
701 for (j = 0; j < intf->num_altsetting; j++) {
702 alts = &intf->altsetting[j];
703 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
704 endpt = &alts->endpoint[e].desc;
705 if (endpt->bEndpointAddress == ep)
706 return alts->desc.bInterfaceNumber;
707 }
708 }
709 }
710 return -ENOENT;
711 }
712
713 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
714 unsigned int request, unsigned int index)
715 {
716 int ret = 0;
717 struct usb_host_interface *alt_setting;
718
719 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
720 && ps->dev->state != USB_STATE_ADDRESS
721 && ps->dev->state != USB_STATE_CONFIGURED)
722 return -EHOSTUNREACH;
723 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
724 return 0;
725
726 /*
727 * check for the special corner case 'get_device_id' in the printer
728 * class specification, which we always want to allow as it is used
729 * to query things like ink level, etc.
730 */
731 if (requesttype == 0xa1 && request == 0) {
732 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
733 index >> 8, index & 0xff);
734 if (alt_setting
735 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
736 return 0;
737 }
738
739 index &= 0xff;
740 switch (requesttype & USB_RECIP_MASK) {
741 case USB_RECIP_ENDPOINT:
742 if ((index & ~USB_DIR_IN) == 0)
743 return 0;
744 ret = findintfep(ps->dev, index);
745 if (ret < 0) {
746 /*
747 * Some not fully compliant Win apps seem to get
748 * index wrong and have the endpoint number here
749 * rather than the endpoint address (with the
750 * correct direction). Win does let this through,
751 * so we'll not reject it here but leave it to
752 * the device to not break KVM. But we warn.
753 */
754 ret = findintfep(ps->dev, index ^ 0x80);
755 if (ret >= 0)
756 dev_info(&ps->dev->dev,
757 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
758 __func__, task_pid_nr(current),
759 current->comm, index, index ^ 0x80);
760 }
761 if (ret >= 0)
762 ret = checkintf(ps, ret);
763 break;
764
765 case USB_RECIP_INTERFACE:
766 ret = checkintf(ps, index);
767 break;
768 }
769 return ret;
770 }
771
772 static int match_devt(struct device *dev, void *data)
773 {
774 return dev->devt == (dev_t) (unsigned long) data;
775 }
776
777 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
778 {
779 struct device *dev;
780
781 dev = bus_find_device(&usb_bus_type, NULL,
782 (void *) (unsigned long) devt, match_devt);
783 if (!dev)
784 return NULL;
785 return container_of(dev, struct usb_device, dev);
786 }
787
788 /*
789 * file operations
790 */
791 static int usbdev_open(struct inode *inode, struct file *file)
792 {
793 struct usb_device *dev = NULL;
794 struct dev_state *ps;
795 int ret;
796
797 ret = -ENOMEM;
798 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
799 if (!ps)
800 goto out_free_ps;
801
802 ret = -ENODEV;
803
804 /* Protect against simultaneous removal or release */
805 mutex_lock(&usbfs_mutex);
806
807 /* usbdev device-node */
808 if (imajor(inode) == USB_DEVICE_MAJOR)
809 dev = usbdev_lookup_by_devt(inode->i_rdev);
810
811 mutex_unlock(&usbfs_mutex);
812
813 if (!dev)
814 goto out_free_ps;
815
816 usb_lock_device(dev);
817 if (dev->state == USB_STATE_NOTATTACHED)
818 goto out_unlock_device;
819
820 ret = usb_autoresume_device(dev);
821 if (ret)
822 goto out_unlock_device;
823
824 ps->dev = dev;
825 ps->file = file;
826 spin_lock_init(&ps->lock);
827 INIT_LIST_HEAD(&ps->list);
828 INIT_LIST_HEAD(&ps->async_pending);
829 INIT_LIST_HEAD(&ps->async_completed);
830 init_waitqueue_head(&ps->wait);
831 ps->discsignr = 0;
832 ps->disc_pid = get_pid(task_pid(current));
833 ps->cred = get_current_cred();
834 ps->disccontext = NULL;
835 ps->ifclaimed = 0;
836 security_task_getsecid(current, &ps->secid);
837 smp_wmb();
838 list_add_tail(&ps->list, &dev->filelist);
839 file->private_data = ps;
840 usb_unlock_device(dev);
841 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
842 current->comm);
843 return ret;
844
845 out_unlock_device:
846 usb_unlock_device(dev);
847 usb_put_dev(dev);
848 out_free_ps:
849 kfree(ps);
850 return ret;
851 }
852
853 static int usbdev_release(struct inode *inode, struct file *file)
854 {
855 struct dev_state *ps = file->private_data;
856 struct usb_device *dev = ps->dev;
857 unsigned int ifnum;
858 struct async *as;
859
860 usb_lock_device(dev);
861 usb_hub_release_all_ports(dev, ps);
862
863 list_del_init(&ps->list);
864
865 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
866 ifnum++) {
867 if (test_bit(ifnum, &ps->ifclaimed))
868 releaseintf(ps, ifnum);
869 }
870 destroy_all_async(ps);
871 usb_autosuspend_device(dev);
872 usb_unlock_device(dev);
873 usb_put_dev(dev);
874 put_pid(ps->disc_pid);
875 put_cred(ps->cred);
876
877 as = async_getcompleted(ps);
878 while (as) {
879 free_async(as);
880 as = async_getcompleted(ps);
881 }
882 kfree(ps);
883 return 0;
884 }
885
886 static int proc_control(struct dev_state *ps, void __user *arg)
887 {
888 struct usb_device *dev = ps->dev;
889 struct usbdevfs_ctrltransfer ctrl;
890 unsigned int tmo;
891 unsigned char *tbuf;
892 unsigned wLength;
893 int i, pipe, ret;
894
895 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
896 return -EFAULT;
897 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
898 ctrl.wIndex);
899 if (ret)
900 return ret;
901 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
902 if (wLength > PAGE_SIZE)
903 return -EINVAL;
904 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
905 sizeof(struct usb_ctrlrequest));
906 if (ret)
907 return ret;
908 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
909 if (!tbuf) {
910 ret = -ENOMEM;
911 goto done;
912 }
913 tmo = ctrl.timeout;
914 snoop(&dev->dev, "control urb: bRequestType=%02x "
915 "bRequest=%02x wValue=%04x "
916 "wIndex=%04x wLength=%04x\n",
917 ctrl.bRequestType, ctrl.bRequest,
918 __le16_to_cpup(&ctrl.wValue),
919 __le16_to_cpup(&ctrl.wIndex),
920 __le16_to_cpup(&ctrl.wLength));
921 if (ctrl.bRequestType & 0x80) {
922 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
923 ctrl.wLength)) {
924 ret = -EINVAL;
925 goto done;
926 }
927 pipe = usb_rcvctrlpipe(dev, 0);
928 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
929
930 usb_unlock_device(dev);
931 i = usb_control_msg(dev, pipe, ctrl.bRequest,
932 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
933 tbuf, ctrl.wLength, tmo);
934 usb_lock_device(dev);
935 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
936 tbuf, max(i, 0));
937 if ((i > 0) && ctrl.wLength) {
938 if (copy_to_user(ctrl.data, tbuf, i)) {
939 ret = -EFAULT;
940 goto done;
941 }
942 }
943 } else {
944 if (ctrl.wLength) {
945 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
946 ret = -EFAULT;
947 goto done;
948 }
949 }
950 pipe = usb_sndctrlpipe(dev, 0);
951 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
952 tbuf, ctrl.wLength);
953
954 usb_unlock_device(dev);
955 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
956 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
957 tbuf, ctrl.wLength, tmo);
958 usb_lock_device(dev);
959 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
960 }
961 if (i < 0 && i != -EPIPE) {
962 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
963 "failed cmd %s rqt %u rq %u len %u ret %d\n",
964 current->comm, ctrl.bRequestType, ctrl.bRequest,
965 ctrl.wLength, i);
966 }
967 ret = i;
968 done:
969 free_page((unsigned long) tbuf);
970 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
971 sizeof(struct usb_ctrlrequest));
972 return ret;
973 }
974
975 static int proc_bulk(struct dev_state *ps, void __user *arg)
976 {
977 struct usb_device *dev = ps->dev;
978 struct usbdevfs_bulktransfer bulk;
979 unsigned int tmo, len1, pipe;
980 int len2;
981 unsigned char *tbuf;
982 int i, ret;
983
984 if (copy_from_user(&bulk, arg, sizeof(bulk)))
985 return -EFAULT;
986 ret = findintfep(ps->dev, bulk.ep);
987 if (ret < 0)
988 return ret;
989 ret = checkintf(ps, ret);
990 if (ret)
991 return ret;
992 if (bulk.ep & USB_DIR_IN)
993 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
994 else
995 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
996 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
997 return -EINVAL;
998 len1 = bulk.len;
999 if (len1 >= USBFS_XFER_MAX)
1000 return -EINVAL;
1001 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1002 if (ret)
1003 return ret;
1004 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
1005 ret = -ENOMEM;
1006 goto done;
1007 }
1008 tmo = bulk.timeout;
1009 if (bulk.ep & 0x80) {
1010 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1011 ret = -EINVAL;
1012 goto done;
1013 }
1014 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1015
1016 usb_unlock_device(dev);
1017 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1018 usb_lock_device(dev);
1019 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1020
1021 if (!i && len2) {
1022 if (copy_to_user(bulk.data, tbuf, len2)) {
1023 ret = -EFAULT;
1024 goto done;
1025 }
1026 }
1027 } else {
1028 if (len1) {
1029 if (copy_from_user(tbuf, bulk.data, len1)) {
1030 ret = -EFAULT;
1031 goto done;
1032 }
1033 }
1034 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1035
1036 usb_unlock_device(dev);
1037 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1038 usb_lock_device(dev);
1039 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1040 }
1041 ret = (i < 0 ? i : len2);
1042 done:
1043 kfree(tbuf);
1044 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1045 return ret;
1046 }
1047
1048 static int proc_resetep(struct dev_state *ps, void __user *arg)
1049 {
1050 unsigned int ep;
1051 int ret;
1052
1053 if (get_user(ep, (unsigned int __user *)arg))
1054 return -EFAULT;
1055 ret = findintfep(ps->dev, ep);
1056 if (ret < 0)
1057 return ret;
1058 ret = checkintf(ps, ret);
1059 if (ret)
1060 return ret;
1061 usb_reset_endpoint(ps->dev, ep);
1062 return 0;
1063 }
1064
1065 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
1066 {
1067 unsigned int ep;
1068 int pipe;
1069 int ret;
1070
1071 if (get_user(ep, (unsigned int __user *)arg))
1072 return -EFAULT;
1073 ret = findintfep(ps->dev, ep);
1074 if (ret < 0)
1075 return ret;
1076 ret = checkintf(ps, ret);
1077 if (ret)
1078 return ret;
1079 if (ep & USB_DIR_IN)
1080 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1081 else
1082 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1083
1084 return usb_clear_halt(ps->dev, pipe);
1085 }
1086
1087 static int proc_getdriver(struct dev_state *ps, void __user *arg)
1088 {
1089 struct usbdevfs_getdriver gd;
1090 struct usb_interface *intf;
1091 int ret;
1092
1093 if (copy_from_user(&gd, arg, sizeof(gd)))
1094 return -EFAULT;
1095 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1096 if (!intf || !intf->dev.driver)
1097 ret = -ENODATA;
1098 else {
1099 strlcpy(gd.driver, intf->dev.driver->name,
1100 sizeof(gd.driver));
1101 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1102 }
1103 return ret;
1104 }
1105
1106 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
1107 {
1108 struct usbdevfs_connectinfo ci = {
1109 .devnum = ps->dev->devnum,
1110 .slow = ps->dev->speed == USB_SPEED_LOW
1111 };
1112
1113 if (copy_to_user(arg, &ci, sizeof(ci)))
1114 return -EFAULT;
1115 return 0;
1116 }
1117
1118 static int proc_resetdevice(struct dev_state *ps)
1119 {
1120 return usb_reset_device(ps->dev);
1121 }
1122
1123 static int proc_setintf(struct dev_state *ps, void __user *arg)
1124 {
1125 struct usbdevfs_setinterface setintf;
1126 int ret;
1127
1128 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1129 return -EFAULT;
1130 if ((ret = checkintf(ps, setintf.interface)))
1131 return ret;
1132 return usb_set_interface(ps->dev, setintf.interface,
1133 setintf.altsetting);
1134 }
1135
1136 static int proc_setconfig(struct dev_state *ps, void __user *arg)
1137 {
1138 int u;
1139 int status = 0;
1140 struct usb_host_config *actconfig;
1141
1142 if (get_user(u, (int __user *)arg))
1143 return -EFAULT;
1144
1145 actconfig = ps->dev->actconfig;
1146
1147 /* Don't touch the device if any interfaces are claimed.
1148 * It could interfere with other drivers' operations, and if
1149 * an interface is claimed by usbfs it could easily deadlock.
1150 */
1151 if (actconfig) {
1152 int i;
1153
1154 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1155 if (usb_interface_claimed(actconfig->interface[i])) {
1156 dev_warn(&ps->dev->dev,
1157 "usbfs: interface %d claimed by %s "
1158 "while '%s' sets config #%d\n",
1159 actconfig->interface[i]
1160 ->cur_altsetting
1161 ->desc.bInterfaceNumber,
1162 actconfig->interface[i]
1163 ->dev.driver->name,
1164 current->comm, u);
1165 status = -EBUSY;
1166 break;
1167 }
1168 }
1169 }
1170
1171 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1172 * so avoid usb_set_configuration()'s kick to sysfs
1173 */
1174 if (status == 0) {
1175 if (actconfig && actconfig->desc.bConfigurationValue == u)
1176 status = usb_reset_configuration(ps->dev);
1177 else
1178 status = usb_set_configuration(ps->dev, u);
1179 }
1180
1181 return status;
1182 }
1183
1184 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1185 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1186 void __user *arg)
1187 {
1188 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1189 struct usb_host_endpoint *ep;
1190 struct async *as = NULL;
1191 struct usb_ctrlrequest *dr = NULL;
1192 unsigned int u, totlen, isofrmlen;
1193 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1194 void *buf;
1195
1196 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1197 USBDEVFS_URB_SHORT_NOT_OK |
1198 USBDEVFS_URB_BULK_CONTINUATION |
1199 USBDEVFS_URB_NO_FSBR |
1200 USBDEVFS_URB_ZERO_PACKET |
1201 USBDEVFS_URB_NO_INTERRUPT))
1202 return -EINVAL;
1203 if (uurb->buffer_length > 0 && !uurb->buffer)
1204 return -EINVAL;
1205 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1206 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1207 ifnum = findintfep(ps->dev, uurb->endpoint);
1208 if (ifnum < 0)
1209 return ifnum;
1210 ret = checkintf(ps, ifnum);
1211 if (ret)
1212 return ret;
1213 }
1214 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1215 is_in = 1;
1216 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1217 } else {
1218 is_in = 0;
1219 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1220 }
1221 if (!ep)
1222 return -ENOENT;
1223
1224 u = 0;
1225 switch(uurb->type) {
1226 case USBDEVFS_URB_TYPE_CONTROL:
1227 if (!usb_endpoint_xfer_control(&ep->desc))
1228 return -EINVAL;
1229 /* min 8 byte setup packet */
1230 if (uurb->buffer_length < 8)
1231 return -EINVAL;
1232 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1233 if (!dr)
1234 return -ENOMEM;
1235 if (copy_from_user(dr, uurb->buffer, 8)) {
1236 ret = -EFAULT;
1237 goto error;
1238 }
1239 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1240 ret = -EINVAL;
1241 goto error;
1242 }
1243 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1244 le16_to_cpup(&dr->wIndex));
1245 if (ret)
1246 goto error;
1247 uurb->number_of_packets = 0;
1248 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1249 uurb->buffer += 8;
1250 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1251 is_in = 1;
1252 uurb->endpoint |= USB_DIR_IN;
1253 } else {
1254 is_in = 0;
1255 uurb->endpoint &= ~USB_DIR_IN;
1256 }
1257 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1258 "bRequest=%02x wValue=%04x "
1259 "wIndex=%04x wLength=%04x\n",
1260 dr->bRequestType, dr->bRequest,
1261 __le16_to_cpup(&dr->wValue),
1262 __le16_to_cpup(&dr->wIndex),
1263 __le16_to_cpup(&dr->wLength));
1264 u = sizeof(struct usb_ctrlrequest);
1265 break;
1266
1267 case USBDEVFS_URB_TYPE_BULK:
1268 switch (usb_endpoint_type(&ep->desc)) {
1269 case USB_ENDPOINT_XFER_CONTROL:
1270 case USB_ENDPOINT_XFER_ISOC:
1271 return -EINVAL;
1272 case USB_ENDPOINT_XFER_INT:
1273 /* allow single-shot interrupt transfers */
1274 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1275 goto interrupt_urb;
1276 }
1277 uurb->number_of_packets = 0;
1278 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1279 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1280 num_sgs = 0;
1281 break;
1282
1283 case USBDEVFS_URB_TYPE_INTERRUPT:
1284 if (!usb_endpoint_xfer_int(&ep->desc))
1285 return -EINVAL;
1286 interrupt_urb:
1287 uurb->number_of_packets = 0;
1288 break;
1289
1290 case USBDEVFS_URB_TYPE_ISO:
1291 /* arbitrary limit */
1292 if (uurb->number_of_packets < 1 ||
1293 uurb->number_of_packets > 128)
1294 return -EINVAL;
1295 if (!usb_endpoint_xfer_isoc(&ep->desc))
1296 return -EINVAL;
1297 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1298 uurb->number_of_packets;
1299 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1300 return -ENOMEM;
1301 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1302 ret = -EFAULT;
1303 goto error;
1304 }
1305 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1306 /*
1307 * arbitrary limit need for USB 3.0
1308 * bMaxBurst (0~15 allowed, 1~16 packets)
1309 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1310 * sizemax: 1024 * 16 * 3 = 49152
1311 */
1312 if (isopkt[u].length > 49152) {
1313 ret = -EINVAL;
1314 goto error;
1315 }
1316 totlen += isopkt[u].length;
1317 }
1318 u *= sizeof(struct usb_iso_packet_descriptor);
1319 uurb->buffer_length = totlen;
1320 break;
1321
1322 default:
1323 return -EINVAL;
1324 }
1325
1326 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1327 ret = -EINVAL;
1328 goto error;
1329 }
1330 if (uurb->buffer_length > 0 &&
1331 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1332 uurb->buffer, uurb->buffer_length)) {
1333 ret = -EFAULT;
1334 goto error;
1335 }
1336 as = alloc_async(uurb->number_of_packets);
1337 if (!as) {
1338 ret = -ENOMEM;
1339 goto error;
1340 }
1341
1342 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1343 num_sgs * sizeof(struct scatterlist);
1344 ret = usbfs_increase_memory_usage(u);
1345 if (ret)
1346 goto error;
1347 as->mem_usage = u;
1348
1349 if (num_sgs) {
1350 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1351 GFP_KERNEL);
1352 if (!as->urb->sg) {
1353 ret = -ENOMEM;
1354 goto error;
1355 }
1356 as->urb->num_sgs = num_sgs;
1357 sg_init_table(as->urb->sg, as->urb->num_sgs);
1358
1359 totlen = uurb->buffer_length;
1360 for (i = 0; i < as->urb->num_sgs; i++) {
1361 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1362 buf = kmalloc(u, GFP_KERNEL);
1363 if (!buf) {
1364 ret = -ENOMEM;
1365 goto error;
1366 }
1367 sg_set_buf(&as->urb->sg[i], buf, u);
1368
1369 if (!is_in) {
1370 if (copy_from_user(buf, uurb->buffer, u)) {
1371 ret = -EFAULT;
1372 goto error;
1373 }
1374 uurb->buffer += u;
1375 }
1376 totlen -= u;
1377 }
1378 } else if (uurb->buffer_length > 0) {
1379 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1380 GFP_KERNEL);
1381 if (!as->urb->transfer_buffer) {
1382 ret = -ENOMEM;
1383 goto error;
1384 }
1385
1386 if (!is_in) {
1387 if (copy_from_user(as->urb->transfer_buffer,
1388 uurb->buffer,
1389 uurb->buffer_length)) {
1390 ret = -EFAULT;
1391 goto error;
1392 }
1393 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1394 /*
1395 * Isochronous input data may end up being
1396 * discontiguous if some of the packets are short.
1397 * Clear the buffer so that the gaps don't leak
1398 * kernel data to userspace.
1399 */
1400 memset(as->urb->transfer_buffer, 0,
1401 uurb->buffer_length);
1402 }
1403 }
1404 as->urb->dev = ps->dev;
1405 as->urb->pipe = (uurb->type << 30) |
1406 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1407 (uurb->endpoint & USB_DIR_IN);
1408
1409 /* This tedious sequence is necessary because the URB_* flags
1410 * are internal to the kernel and subject to change, whereas
1411 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1412 */
1413 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1414 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1415 u |= URB_ISO_ASAP;
1416 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1417 u |= URB_SHORT_NOT_OK;
1418 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1419 u |= URB_NO_FSBR;
1420 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1421 u |= URB_ZERO_PACKET;
1422 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1423 u |= URB_NO_INTERRUPT;
1424 as->urb->transfer_flags = u;
1425
1426 as->urb->transfer_buffer_length = uurb->buffer_length;
1427 as->urb->setup_packet = (unsigned char *)dr;
1428 dr = NULL;
1429 as->urb->start_frame = uurb->start_frame;
1430 as->urb->number_of_packets = uurb->number_of_packets;
1431 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1432 ps->dev->speed == USB_SPEED_HIGH)
1433 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1434 else
1435 as->urb->interval = ep->desc.bInterval;
1436 as->urb->context = as;
1437 as->urb->complete = async_completed;
1438 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1439 as->urb->iso_frame_desc[u].offset = totlen;
1440 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1441 totlen += isopkt[u].length;
1442 }
1443 kfree(isopkt);
1444 isopkt = NULL;
1445 as->ps = ps;
1446 as->userurb = arg;
1447 if (is_in && uurb->buffer_length > 0)
1448 as->userbuffer = uurb->buffer;
1449 else
1450 as->userbuffer = NULL;
1451 as->signr = uurb->signr;
1452 as->ifnum = ifnum;
1453 as->pid = get_pid(task_pid(current));
1454 as->cred = get_current_cred();
1455 security_task_getsecid(current, &as->secid);
1456 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1457 as->urb->transfer_buffer_length, 0, SUBMIT,
1458 NULL, 0);
1459 if (!is_in)
1460 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1461
1462 async_newpending(as);
1463
1464 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1465 spin_lock_irq(&ps->lock);
1466
1467 /* Not exactly the endpoint address; the direction bit is
1468 * shifted to the 0x10 position so that the value will be
1469 * between 0 and 31.
1470 */
1471 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1472 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1473 >> 3);
1474
1475 /* If this bulk URB is the start of a new transfer, re-enable
1476 * the endpoint. Otherwise mark it as a continuation URB.
1477 */
1478 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1479 as->bulk_status = AS_CONTINUATION;
1480 else
1481 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1482
1483 /* Don't accept continuation URBs if the endpoint is
1484 * disabled because of an earlier error.
1485 */
1486 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1487 ret = -EREMOTEIO;
1488 else
1489 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1490 spin_unlock_irq(&ps->lock);
1491 } else {
1492 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1493 }
1494
1495 if (ret) {
1496 dev_printk(KERN_DEBUG, &ps->dev->dev,
1497 "usbfs: usb_submit_urb returned %d\n", ret);
1498 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1499 0, ret, COMPLETE, NULL, 0);
1500 async_removepending(as);
1501 goto error;
1502 }
1503 return 0;
1504
1505 error:
1506 kfree(isopkt);
1507 kfree(dr);
1508 if (as)
1509 free_async(as);
1510 return ret;
1511 }
1512
1513 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1514 {
1515 struct usbdevfs_urb uurb;
1516
1517 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1518 return -EFAULT;
1519
1520 return proc_do_submiturb(ps, &uurb,
1521 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1522 arg);
1523 }
1524
1525 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1526 {
1527 struct urb *urb;
1528 struct async *as;
1529 unsigned long flags;
1530
1531 spin_lock_irqsave(&ps->lock, flags);
1532 as = async_getpending(ps, arg);
1533 if (!as) {
1534 spin_unlock_irqrestore(&ps->lock, flags);
1535 return -EINVAL;
1536 }
1537
1538 urb = as->urb;
1539 usb_get_urb(urb);
1540 spin_unlock_irqrestore(&ps->lock, flags);
1541
1542 usb_kill_urb(urb);
1543 usb_put_urb(urb);
1544
1545 return 0;
1546 }
1547
1548 static int processcompl(struct async *as, void __user * __user *arg)
1549 {
1550 struct urb *urb = as->urb;
1551 struct usbdevfs_urb __user *userurb = as->userurb;
1552 void __user *addr = as->userurb;
1553 unsigned int i;
1554
1555 if (as->userbuffer && urb->actual_length) {
1556 if (copy_urb_data_to_user(as->userbuffer, urb))
1557 goto err_out;
1558 }
1559 if (put_user(as->status, &userurb->status))
1560 goto err_out;
1561 if (put_user(urb->actual_length, &userurb->actual_length))
1562 goto err_out;
1563 if (put_user(urb->error_count, &userurb->error_count))
1564 goto err_out;
1565
1566 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1567 for (i = 0; i < urb->number_of_packets; i++) {
1568 if (put_user(urb->iso_frame_desc[i].actual_length,
1569 &userurb->iso_frame_desc[i].actual_length))
1570 goto err_out;
1571 if (put_user(urb->iso_frame_desc[i].status,
1572 &userurb->iso_frame_desc[i].status))
1573 goto err_out;
1574 }
1575 }
1576
1577 if (put_user(addr, (void __user * __user *)arg))
1578 return -EFAULT;
1579 return 0;
1580
1581 err_out:
1582 return -EFAULT;
1583 }
1584
1585 static struct async *reap_as(struct dev_state *ps)
1586 {
1587 DECLARE_WAITQUEUE(wait, current);
1588 struct async *as = NULL;
1589 struct usb_device *dev = ps->dev;
1590
1591 add_wait_queue(&ps->wait, &wait);
1592 for (;;) {
1593 __set_current_state(TASK_INTERRUPTIBLE);
1594 as = async_getcompleted(ps);
1595 if (as)
1596 break;
1597 if (signal_pending(current))
1598 break;
1599 usb_unlock_device(dev);
1600 schedule();
1601 usb_lock_device(dev);
1602 }
1603 remove_wait_queue(&ps->wait, &wait);
1604 set_current_state(TASK_RUNNING);
1605 return as;
1606 }
1607
1608 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1609 {
1610 struct async *as = reap_as(ps);
1611 if (as) {
1612 int retval = processcompl(as, (void __user * __user *)arg);
1613 free_async(as);
1614 return retval;
1615 }
1616 if (signal_pending(current))
1617 return -EINTR;
1618 return -EIO;
1619 }
1620
1621 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1622 {
1623 int retval;
1624 struct async *as;
1625
1626 as = async_getcompleted(ps);
1627 retval = -EAGAIN;
1628 if (as) {
1629 retval = processcompl(as, (void __user * __user *)arg);
1630 free_async(as);
1631 }
1632 return retval;
1633 }
1634
1635 #ifdef CONFIG_COMPAT
1636 static int proc_control_compat(struct dev_state *ps,
1637 struct usbdevfs_ctrltransfer32 __user *p32)
1638 {
1639 struct usbdevfs_ctrltransfer __user *p;
1640 __u32 udata;
1641 p = compat_alloc_user_space(sizeof(*p));
1642 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1643 get_user(udata, &p32->data) ||
1644 put_user(compat_ptr(udata), &p->data))
1645 return -EFAULT;
1646 return proc_control(ps, p);
1647 }
1648
1649 static int proc_bulk_compat(struct dev_state *ps,
1650 struct usbdevfs_bulktransfer32 __user *p32)
1651 {
1652 struct usbdevfs_bulktransfer __user *p;
1653 compat_uint_t n;
1654 compat_caddr_t addr;
1655
1656 p = compat_alloc_user_space(sizeof(*p));
1657
1658 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1659 get_user(n, &p32->len) || put_user(n, &p->len) ||
1660 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1661 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1662 return -EFAULT;
1663
1664 return proc_bulk(ps, p);
1665 }
1666 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1667 {
1668 struct usbdevfs_disconnectsignal32 ds;
1669
1670 if (copy_from_user(&ds, arg, sizeof(ds)))
1671 return -EFAULT;
1672 ps->discsignr = ds.signr;
1673 ps->disccontext = compat_ptr(ds.context);
1674 return 0;
1675 }
1676
1677 static int get_urb32(struct usbdevfs_urb *kurb,
1678 struct usbdevfs_urb32 __user *uurb)
1679 {
1680 __u32 uptr;
1681 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1682 __get_user(kurb->type, &uurb->type) ||
1683 __get_user(kurb->endpoint, &uurb->endpoint) ||
1684 __get_user(kurb->status, &uurb->status) ||
1685 __get_user(kurb->flags, &uurb->flags) ||
1686 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1687 __get_user(kurb->actual_length, &uurb->actual_length) ||
1688 __get_user(kurb->start_frame, &uurb->start_frame) ||
1689 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1690 __get_user(kurb->error_count, &uurb->error_count) ||
1691 __get_user(kurb->signr, &uurb->signr))
1692 return -EFAULT;
1693
1694 if (__get_user(uptr, &uurb->buffer))
1695 return -EFAULT;
1696 kurb->buffer = compat_ptr(uptr);
1697 if (__get_user(uptr, &uurb->usercontext))
1698 return -EFAULT;
1699 kurb->usercontext = compat_ptr(uptr);
1700
1701 return 0;
1702 }
1703
1704 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1705 {
1706 struct usbdevfs_urb uurb;
1707
1708 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1709 return -EFAULT;
1710
1711 return proc_do_submiturb(ps, &uurb,
1712 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1713 arg);
1714 }
1715
1716 static int processcompl_compat(struct async *as, void __user * __user *arg)
1717 {
1718 struct urb *urb = as->urb;
1719 struct usbdevfs_urb32 __user *userurb = as->userurb;
1720 void __user *addr = as->userurb;
1721 unsigned int i;
1722
1723 if (as->userbuffer && urb->actual_length) {
1724 if (copy_urb_data_to_user(as->userbuffer, urb))
1725 return -EFAULT;
1726 }
1727 if (put_user(as->status, &userurb->status))
1728 return -EFAULT;
1729 if (put_user(urb->actual_length, &userurb->actual_length))
1730 return -EFAULT;
1731 if (put_user(urb->error_count, &userurb->error_count))
1732 return -EFAULT;
1733
1734 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1735 for (i = 0; i < urb->number_of_packets; i++) {
1736 if (put_user(urb->iso_frame_desc[i].actual_length,
1737 &userurb->iso_frame_desc[i].actual_length))
1738 return -EFAULT;
1739 if (put_user(urb->iso_frame_desc[i].status,
1740 &userurb->iso_frame_desc[i].status))
1741 return -EFAULT;
1742 }
1743 }
1744
1745 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1746 return -EFAULT;
1747 return 0;
1748 }
1749
1750 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1751 {
1752 struct async *as = reap_as(ps);
1753 if (as) {
1754 int retval = processcompl_compat(as, (void __user * __user *)arg);
1755 free_async(as);
1756 return retval;
1757 }
1758 if (signal_pending(current))
1759 return -EINTR;
1760 return -EIO;
1761 }
1762
1763 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1764 {
1765 int retval;
1766 struct async *as;
1767
1768 retval = -EAGAIN;
1769 as = async_getcompleted(ps);
1770 if (as) {
1771 retval = processcompl_compat(as, (void __user * __user *)arg);
1772 free_async(as);
1773 }
1774 return retval;
1775 }
1776
1777
1778 #endif
1779
1780 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1781 {
1782 struct usbdevfs_disconnectsignal ds;
1783
1784 if (copy_from_user(&ds, arg, sizeof(ds)))
1785 return -EFAULT;
1786 ps->discsignr = ds.signr;
1787 ps->disccontext = ds.context;
1788 return 0;
1789 }
1790
1791 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1792 {
1793 unsigned int ifnum;
1794
1795 if (get_user(ifnum, (unsigned int __user *)arg))
1796 return -EFAULT;
1797 return claimintf(ps, ifnum);
1798 }
1799
1800 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1801 {
1802 unsigned int ifnum;
1803 int ret;
1804
1805 if (get_user(ifnum, (unsigned int __user *)arg))
1806 return -EFAULT;
1807 if ((ret = releaseintf(ps, ifnum)) < 0)
1808 return ret;
1809 destroy_async_on_interface (ps, ifnum);
1810 return 0;
1811 }
1812
1813 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1814 {
1815 int size;
1816 void *buf = NULL;
1817 int retval = 0;
1818 struct usb_interface *intf = NULL;
1819 struct usb_driver *driver = NULL;
1820
1821 /* alloc buffer */
1822 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1823 buf = kmalloc(size, GFP_KERNEL);
1824 if (buf == NULL)
1825 return -ENOMEM;
1826 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1827 if (copy_from_user(buf, ctl->data, size)) {
1828 kfree(buf);
1829 return -EFAULT;
1830 }
1831 } else {
1832 memset(buf, 0, size);
1833 }
1834 }
1835
1836 if (!connected(ps)) {
1837 kfree(buf);
1838 return -ENODEV;
1839 }
1840
1841 if (ps->dev->state != USB_STATE_CONFIGURED)
1842 retval = -EHOSTUNREACH;
1843 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1844 retval = -EINVAL;
1845 else switch (ctl->ioctl_code) {
1846
1847 /* disconnect kernel driver from interface */
1848 case USBDEVFS_DISCONNECT:
1849 if (intf->dev.driver) {
1850 driver = to_usb_driver(intf->dev.driver);
1851 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1852 usb_driver_release_interface(driver, intf);
1853 } else
1854 retval = -ENODATA;
1855 break;
1856
1857 /* let kernel drivers try to (re)bind to the interface */
1858 case USBDEVFS_CONNECT:
1859 if (!intf->dev.driver)
1860 retval = device_attach(&intf->dev);
1861 else
1862 retval = -EBUSY;
1863 break;
1864
1865 /* talk directly to the interface's driver */
1866 default:
1867 if (intf->dev.driver)
1868 driver = to_usb_driver(intf->dev.driver);
1869 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1870 retval = -ENOTTY;
1871 } else {
1872 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1873 if (retval == -ENOIOCTLCMD)
1874 retval = -ENOTTY;
1875 }
1876 }
1877
1878 /* cleanup and return */
1879 if (retval >= 0
1880 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1881 && size > 0
1882 && copy_to_user(ctl->data, buf, size) != 0)
1883 retval = -EFAULT;
1884
1885 kfree(buf);
1886 return retval;
1887 }
1888
1889 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1890 {
1891 struct usbdevfs_ioctl ctrl;
1892
1893 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1894 return -EFAULT;
1895 return proc_ioctl(ps, &ctrl);
1896 }
1897
1898 #ifdef CONFIG_COMPAT
1899 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1900 {
1901 struct usbdevfs_ioctl32 __user *uioc;
1902 struct usbdevfs_ioctl ctrl;
1903 u32 udata;
1904
1905 uioc = compat_ptr((long)arg);
1906 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1907 __get_user(ctrl.ifno, &uioc->ifno) ||
1908 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1909 __get_user(udata, &uioc->data))
1910 return -EFAULT;
1911 ctrl.data = compat_ptr(udata);
1912
1913 return proc_ioctl(ps, &ctrl);
1914 }
1915 #endif
1916
1917 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1918 {
1919 unsigned portnum;
1920 int rc;
1921
1922 if (get_user(portnum, (unsigned __user *) arg))
1923 return -EFAULT;
1924 rc = usb_hub_claim_port(ps->dev, portnum, ps);
1925 if (rc == 0)
1926 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1927 portnum, task_pid_nr(current), current->comm);
1928 return rc;
1929 }
1930
1931 static int proc_release_port(struct dev_state *ps, void __user *arg)
1932 {
1933 unsigned portnum;
1934
1935 if (get_user(portnum, (unsigned __user *) arg))
1936 return -EFAULT;
1937 return usb_hub_release_port(ps->dev, portnum, ps);
1938 }
1939
1940 static int proc_get_capabilities(struct dev_state *ps, void __user *arg)
1941 {
1942 __u32 caps;
1943
1944 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM;
1945 if (!ps->dev->bus->no_stop_on_short)
1946 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
1947 if (ps->dev->bus->sg_tablesize)
1948 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
1949
1950 if (put_user(caps, (__u32 __user *)arg))
1951 return -EFAULT;
1952
1953 return 0;
1954 }
1955
1956 static int proc_disconnect_claim(struct dev_state *ps, void __user *arg)
1957 {
1958 struct usbdevfs_disconnect_claim dc;
1959 struct usb_interface *intf;
1960
1961 if (copy_from_user(&dc, arg, sizeof(dc)))
1962 return -EFAULT;
1963
1964 intf = usb_ifnum_to_if(ps->dev, dc.interface);
1965 if (!intf)
1966 return -EINVAL;
1967
1968 if (intf->dev.driver) {
1969 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
1970
1971 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
1972 strncmp(dc.driver, intf->dev.driver->name,
1973 sizeof(dc.driver)) != 0)
1974 return -EBUSY;
1975
1976 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
1977 strncmp(dc.driver, intf->dev.driver->name,
1978 sizeof(dc.driver)) == 0)
1979 return -EBUSY;
1980
1981 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1982 usb_driver_release_interface(driver, intf);
1983 }
1984
1985 return claimintf(ps, dc.interface);
1986 }
1987
1988 /*
1989 * NOTE: All requests here that have interface numbers as parameters
1990 * are assuming that somehow the configuration has been prevented from
1991 * changing. But there's no mechanism to ensure that...
1992 */
1993 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1994 void __user *p)
1995 {
1996 struct dev_state *ps = file->private_data;
1997 struct inode *inode = file_inode(file);
1998 struct usb_device *dev = ps->dev;
1999 int ret = -ENOTTY;
2000
2001 if (!(file->f_mode & FMODE_WRITE))
2002 return -EPERM;
2003
2004 usb_lock_device(dev);
2005 if (!connected(ps)) {
2006 usb_unlock_device(dev);
2007 return -ENODEV;
2008 }
2009
2010 switch (cmd) {
2011 case USBDEVFS_CONTROL:
2012 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2013 ret = proc_control(ps, p);
2014 if (ret >= 0)
2015 inode->i_mtime = CURRENT_TIME;
2016 break;
2017
2018 case USBDEVFS_BULK:
2019 snoop(&dev->dev, "%s: BULK\n", __func__);
2020 ret = proc_bulk(ps, p);
2021 if (ret >= 0)
2022 inode->i_mtime = CURRENT_TIME;
2023 break;
2024
2025 case USBDEVFS_RESETEP:
2026 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2027 ret = proc_resetep(ps, p);
2028 if (ret >= 0)
2029 inode->i_mtime = CURRENT_TIME;
2030 break;
2031
2032 case USBDEVFS_RESET:
2033 snoop(&dev->dev, "%s: RESET\n", __func__);
2034 ret = proc_resetdevice(ps);
2035 break;
2036
2037 case USBDEVFS_CLEAR_HALT:
2038 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2039 ret = proc_clearhalt(ps, p);
2040 if (ret >= 0)
2041 inode->i_mtime = CURRENT_TIME;
2042 break;
2043
2044 case USBDEVFS_GETDRIVER:
2045 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2046 ret = proc_getdriver(ps, p);
2047 break;
2048
2049 case USBDEVFS_CONNECTINFO:
2050 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2051 ret = proc_connectinfo(ps, p);
2052 break;
2053
2054 case USBDEVFS_SETINTERFACE:
2055 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2056 ret = proc_setintf(ps, p);
2057 break;
2058
2059 case USBDEVFS_SETCONFIGURATION:
2060 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2061 ret = proc_setconfig(ps, p);
2062 break;
2063
2064 case USBDEVFS_SUBMITURB:
2065 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2066 ret = proc_submiturb(ps, p);
2067 if (ret >= 0)
2068 inode->i_mtime = CURRENT_TIME;
2069 break;
2070
2071 #ifdef CONFIG_COMPAT
2072 case USBDEVFS_CONTROL32:
2073 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2074 ret = proc_control_compat(ps, p);
2075 if (ret >= 0)
2076 inode->i_mtime = CURRENT_TIME;
2077 break;
2078
2079 case USBDEVFS_BULK32:
2080 snoop(&dev->dev, "%s: BULK32\n", __func__);
2081 ret = proc_bulk_compat(ps, p);
2082 if (ret >= 0)
2083 inode->i_mtime = CURRENT_TIME;
2084 break;
2085
2086 case USBDEVFS_DISCSIGNAL32:
2087 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2088 ret = proc_disconnectsignal_compat(ps, p);
2089 break;
2090
2091 case USBDEVFS_SUBMITURB32:
2092 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2093 ret = proc_submiturb_compat(ps, p);
2094 if (ret >= 0)
2095 inode->i_mtime = CURRENT_TIME;
2096 break;
2097
2098 case USBDEVFS_REAPURB32:
2099 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2100 ret = proc_reapurb_compat(ps, p);
2101 break;
2102
2103 case USBDEVFS_REAPURBNDELAY32:
2104 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2105 ret = proc_reapurbnonblock_compat(ps, p);
2106 break;
2107
2108 case USBDEVFS_IOCTL32:
2109 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2110 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2111 break;
2112 #endif
2113
2114 case USBDEVFS_DISCARDURB:
2115 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2116 ret = proc_unlinkurb(ps, p);
2117 break;
2118
2119 case USBDEVFS_REAPURB:
2120 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2121 ret = proc_reapurb(ps, p);
2122 break;
2123
2124 case USBDEVFS_REAPURBNDELAY:
2125 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2126 ret = proc_reapurbnonblock(ps, p);
2127 break;
2128
2129 case USBDEVFS_DISCSIGNAL:
2130 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2131 ret = proc_disconnectsignal(ps, p);
2132 break;
2133
2134 case USBDEVFS_CLAIMINTERFACE:
2135 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2136 ret = proc_claiminterface(ps, p);
2137 break;
2138
2139 case USBDEVFS_RELEASEINTERFACE:
2140 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2141 ret = proc_releaseinterface(ps, p);
2142 break;
2143
2144 case USBDEVFS_IOCTL:
2145 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2146 ret = proc_ioctl_default(ps, p);
2147 break;
2148
2149 case USBDEVFS_CLAIM_PORT:
2150 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2151 ret = proc_claim_port(ps, p);
2152 break;
2153
2154 case USBDEVFS_RELEASE_PORT:
2155 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2156 ret = proc_release_port(ps, p);
2157 break;
2158 case USBDEVFS_GET_CAPABILITIES:
2159 ret = proc_get_capabilities(ps, p);
2160 break;
2161 case USBDEVFS_DISCONNECT_CLAIM:
2162 ret = proc_disconnect_claim(ps, p);
2163 break;
2164 }
2165 usb_unlock_device(dev);
2166 if (ret >= 0)
2167 inode->i_atime = CURRENT_TIME;
2168 return ret;
2169 }
2170
2171 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2172 unsigned long arg)
2173 {
2174 int ret;
2175
2176 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2177
2178 return ret;
2179 }
2180
2181 #ifdef CONFIG_COMPAT
2182 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2183 unsigned long arg)
2184 {
2185 int ret;
2186
2187 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2188
2189 return ret;
2190 }
2191 #endif
2192
2193 /* No kernel lock - fine */
2194 static unsigned int usbdev_poll(struct file *file,
2195 struct poll_table_struct *wait)
2196 {
2197 struct dev_state *ps = file->private_data;
2198 unsigned int mask = 0;
2199
2200 poll_wait(file, &ps->wait, wait);
2201 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2202 mask |= POLLOUT | POLLWRNORM;
2203 if (!connected(ps))
2204 mask |= POLLERR | POLLHUP;
2205 return mask;
2206 }
2207
2208 const struct file_operations usbdev_file_operations = {
2209 .owner = THIS_MODULE,
2210 .llseek = usbdev_lseek,
2211 .read = usbdev_read,
2212 .poll = usbdev_poll,
2213 .unlocked_ioctl = usbdev_ioctl,
2214 #ifdef CONFIG_COMPAT
2215 .compat_ioctl = usbdev_compat_ioctl,
2216 #endif
2217 .open = usbdev_open,
2218 .release = usbdev_release,
2219 };
2220
2221 static void usbdev_remove(struct usb_device *udev)
2222 {
2223 struct dev_state *ps;
2224 struct siginfo sinfo;
2225
2226 while (!list_empty(&udev->filelist)) {
2227 ps = list_entry(udev->filelist.next, struct dev_state, list);
2228 destroy_all_async(ps);
2229 wake_up_all(&ps->wait);
2230 list_del_init(&ps->list);
2231 if (ps->discsignr) {
2232 sinfo.si_signo = ps->discsignr;
2233 sinfo.si_errno = EPIPE;
2234 sinfo.si_code = SI_ASYNCIO;
2235 sinfo.si_addr = ps->disccontext;
2236 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2237 ps->disc_pid, ps->cred, ps->secid);
2238 }
2239 }
2240 }
2241
2242 static int usbdev_notify(struct notifier_block *self,
2243 unsigned long action, void *dev)
2244 {
2245 switch (action) {
2246 case USB_DEVICE_ADD:
2247 break;
2248 case USB_DEVICE_REMOVE:
2249 usbdev_remove(dev);
2250 break;
2251 }
2252 return NOTIFY_OK;
2253 }
2254
2255 static struct notifier_block usbdev_nb = {
2256 .notifier_call = usbdev_notify,
2257 };
2258
2259 static struct cdev usb_device_cdev;
2260
2261 int __init usb_devio_init(void)
2262 {
2263 int retval;
2264
2265 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2266 "usb_device");
2267 if (retval) {
2268 printk(KERN_ERR "Unable to register minors for usb_device\n");
2269 goto out;
2270 }
2271 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2272 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2273 if (retval) {
2274 printk(KERN_ERR "Unable to get usb_device major %d\n",
2275 USB_DEVICE_MAJOR);
2276 goto error_cdev;
2277 }
2278 usb_register_notify(&usbdev_nb);
2279 out:
2280 return retval;
2281
2282 error_cdev:
2283 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2284 goto out;
2285 }
2286
2287 void usb_devio_cleanup(void)
2288 {
2289 usb_unregister_notify(&usbdev_nb);
2290 cdev_del(&usb_device_cdev);
2291 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2292 }
Linux kernel - Deliverables
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